CN109762351B - Modified asphalt and preparation method thereof - Google Patents
Modified asphalt and preparation method thereof Download PDFInfo
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- CN109762351B CN109762351B CN201811581271.5A CN201811581271A CN109762351B CN 109762351 B CN109762351 B CN 109762351B CN 201811581271 A CN201811581271 A CN 201811581271A CN 109762351 B CN109762351 B CN 109762351B
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Abstract
The invention relates to modified asphalt and a preparation method thereof, wherein the modified asphalt comprises, by weight, 10-20 parts of polycarbosilane, 5-10 parts of a silane coupling agent and 90-100 parts of asphalt. In the invention, the polycarbosilane and the silane coupling agent can be well dissolved with the asphalt to form a stable homogeneous system, so that the separation and layering are avoided, and the storage and the transportation are convenient; the polycarbosilane precursor has higher softening point and good thermal stability and rheological property, and can improve the temperature stability of the modified asphalt; the polycarbosilane has thermosetting property, and can further carry out crosslinking reaction along with the rise of temperature to form a three-dimensional network structure, so that the modified asphalt has better viscosity and ageing resistance.
Description
Technical Field
The invention relates to modified asphalt and a preparation method thereof, in particular to polycarbosilane modified asphalt and a preparation method thereof.
Background
In recent decades, the road construction business in China has been rapidly developed, and the total road mileage reaches 477.35 kilometers in the whole country by the end of 2017, which is the first place in the world. Compared with cement pavement, the asphalt pavement has the advantages of smooth surface, no joint, comfortable driving, small vibration, low noise, wear resistance, no dust emission, easy cleaning, short construction period, simple and convenient maintenance and the like, so that the asphalt pavement is widely applied. Along with the development of economy in China, road traffic volume is increased year by year, vehicle axle load is heavier and heavier, the performance requirement on road asphalt is higher and higher, and the existing matrix asphalt is difficult to meet the construction requirement of high-grade roads.
In order to improve the performance of the asphalt material, modified asphalt is produced. Currently, polymer modified asphalt is the most common modified asphalt, and there are three main types according to the types of modifiers: rubber modified asphalt, thermoplastic elastomer modified asphalt and resin modified asphalt. Among them, SBS and the like are one of the most used modifiers in various countries at present.
SBS has both the elastic property of rubber and the thermoplastic property of resin, so that it has the advantages of high elasticity, high tensile strength, high low temperature deformation performance, etc. and can raise the high temperature stability and low temperature crack resistance of asphalt. The good modification performance of SBS makes SBS modified asphalt become the most widely used modified asphalt at home and abroad. However, due to the poor compatibility between SBS and the matrix asphalt, segregation is easy to occur when SBS is added into the matrix asphalt, and a stable homogeneous system is difficult to form with the matrix asphalt, namely, the prepared SBS modified asphalt has poor stability, thereby seriously affecting the modification effect of the polymer.
The SBS and the asphalt have large difference in properties such as density, polarity, molecular weight, solubility parameter and the like, so that the compatibility between the SBS and the asphalt is poor, the phase separation of the SBS asphalt blending system is performed spontaneously, SBS coagulation and segregation can occur once stirring is stopped, even if the SBS is refined and uniformly dispersed in the asphalt, a stable homogeneous system cannot be formed, and the SBS is coagulated to cause segregation and delamination due to the reduction of surface energy in the storage and transportation processes, so that the stability of the modified asphalt system is damaged, and the modification effect of the modified asphalt is seriously affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides modified asphalt and a preparation method thereof, which solve the problem of poor stability of the prior modified asphalt while realizing modification.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the modified asphalt comprises, by weight, 10-20 parts of polycarbosilane, 5-10 parts of a silane coupling agent and 90-100 parts of asphalt.
Further, the paint comprises, by weight, 12-18 parts of polycarbosilane, 6-8 parts of a silane coupling agent and 92-97 parts of asphalt.
Further, the asphalt coating comprises 15 parts by weight of polycarbosilane, 8 parts by weight of silane coupling agent and 100 parts by weight of asphalt.
Further, the softening point of the polycarbosilane is 90-110 ℃. Preferably, the polycarbosilane has a softening point of 90 ℃.
Further, the asphalt is a base asphalt, preferably, the asphalt is a petroleum base asphalt.
Preferably, the silane coupling agent is KH792 silane coupling agent.
The preparation method of the modified asphalt comprises the following steps:
s1, heating the asphalt to 150-170 ℃ to obtain asphalt slurry, and stirring for later use;
s2, adding polycarbosilane powder into the asphalt slurry according to the proportion, and uniformly stirring; and adding a silane coupling agent, and uniformly stirring to obtain a modified asphalt finished product.
Further, in S1, the stirring speed is 30-60 r/min.
Further, in S2, adding polycarbosilane powder into the asphalt slurry, stirring at a speed of 30-60r/min for 5-9min, then at a speed of 60-100r/min for 4-8min, and then at a speed of 30-60r/min for later use; after adding the silane coupling agent, stirring for 5-9min at the speed of 30-60r/min, then stirring for 4-8min at the speed of 60-100r/min, and then stirring for 6-10min at the speed of 30-60r/min to obtain a finished product of the modified asphalt. Therefore, the mixture is firstly stirred at a low speed to ensure that the mixture is partially uniform, and then stirred at a high speed to ensure that the mixture is more uniform and the crosslinking is accelerated, so that the mixture and the asphalt can better form a three-dimensional network.
Further, the grain size of the polycarbosilane powder is 2-10 meshes.
Polycarbosilanes are novel highly branched organosilicon polymers having a density of 1.0g/cm3The molecular weight is generally between 1000 and 5000, the polymer is a linear solid polymer, the main chain of the polymer is composed of silicon and carbon atoms in an alternating mode, hydrogen or organic groups are connected to the silicon and the carbon atoms, the molecular chain is in a linear or branched structure, the molecular form is oblate spheroid, the molecular branching degree is high, the internal structure of the molecule is compact, and the polymer has good rheological property and thermal stability. The polycarbosilane is better mutually soluble with the asphalt by adding the silane coupling agent serving as a solubilizer, and the molecules have active Si-H bonds, so that a cross-linking reaction can be further carried out to form an organic three-dimensional network (see figure 1), the asphalt is distributed in the form of approximately spherical particles to form a stable boundary phase, and the structure and the strength of the interface improve the physical and chemical properties of the modified asphalt, so that the modified asphalt has good stability and ageing resistance. The intermolecular crosslinking reaction is represented by the formula (1) to the formula (4).
Compared with the prior art, the invention has the following beneficial effects:
1) the polycarbosilane-silane coupling agent modified system can be well dissolved with asphalt to form a stable homogeneous system, so that segregation and layering are avoided, and the storage and transportation are facilitated;
2) the polycarbosilane precursor has higher softening point and good thermal stability and rheological property, and can improve the temperature stability of the modified asphalt;
3) the polycarbosilane has thermosetting property, and can further carry out crosslinking reaction along with the rise of temperature to form a three-dimensional network structure, so that the modified asphalt has better viscosity and ageing resistance.
Drawings
FIG. 1 is a schematic representation of a molecular model of the organic three-dimensional network of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
In this example, the preparation method of the modified asphalt is as follows:
1) respectively weighing 100 parts of petroleum base asphalt, 15 parts of polycarbosilane powder (the softening point is 90 ℃, and the mesh number is 4) and 8 parts of KH792 silane coupling agent for later use;
2) heating petroleum base asphalt to 160 ℃, and keeping the temperature for the next process under the state of slow stirring (40 r/min);
3) adding the weighed polycarbosilane powder into petroleum matrix asphalt, firstly stirring at a low speed (40r/min) for 7min, then stirring at a medium speed (80r/min) for about 6min until the polycarbosilane powder is uniformly dispersed to obtain a mixture A, and waiting for the next process under the state of stirring at a low speed (40 r/min);
4) adding the weighed KH792 silane coupling agent into the mixture A, slowly stirring for 7min, and then stirring at a medium speed (80r/min) for about 6min until the silane coupling agent is uniformly dispersed; and stirring for 8 minutes under the state of slow stirring (40r/min), thus finishing the preparation of the polycarbosilane modified asphalt.
Comparative example 2
In this comparative example, the preparation method of the modified asphalt was as follows:
1) weighing 100 parts of petroleum base asphalt and 15 parts of polycarbosilane powder (the softening point is 90 ℃, and the mesh number is 4) according to parts by weight for later use;
2) heating petroleum base asphalt to 160 ℃, and keeping the temperature for the next process under the state of slow stirring (40 r/min);
3) and adding the weighed polycarbosilane powder into petroleum matrix asphalt, firstly stirring at a low speed (40r/min) for 7min, then stirring at a medium speed (80r/min) for about 6min until the polycarbosilane powder is uniformly dispersed to obtain a mixture A, and stirring for 8min under the state of stirring at a low speed (40r/min), thus finishing the preparation of the modified asphalt.
Comparative example 3
In this comparative example, the preparation method of the modified asphalt was as follows:
1) respectively weighing 100 parts of petroleum base asphalt and 8 parts of KH792 silane coupling agent for later use;
2) heating petroleum base asphalt to 160 ℃, and keeping the temperature for the next process under the state of slow stirring (40 r/min);
4) adding the weighed KH792 silane coupling agent into petroleum-based asphalt, slowly stirring for 7min, and then stirring at a medium speed (80r/min) for about 6min until the silane coupling agent is uniformly dispersed; and stirring for 8 minutes under the state of slow stirring (40r/min), thus finishing the preparation of the modified asphalt.
The modified asphalt prepared in the above examples 1, 2 and 3 was subjected to segregation test of polymer modified asphalt according to T0661-2011 of test procedures for road engineering asphalt and asphalt mixtures, and the difference between the softening points of the upper and lower layers was measured to determine the stability, and the specific data are shown in table 1.
TABLE 1 comparison of bitumen segregation test cases
Experimental results show that the performance of the modified asphalt in the embodiment 1 is obviously enhanced, obvious segregation and delamination do not occur, the polycarbosilane is not uniformly dispersed in the asphalt due to no addition of the silane coupling agent in the comparative example 2, the performance of the asphalt is not obviously improved, the phenomenon of segregation and delamination occurs, the stability is poor, and the silane coupling agent is only added in the comparative example 3, so that the performance of the asphalt is not obviously changed, and the asphalt is not modified. By contrast, the polycarbosilane, the silane coupling agent and other components are absent, and have a synergistic effect, so that the performance of the asphalt is remarkably improved, and the stability of the modified asphalt is good.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (2)
1. The preparation method of the modified asphalt is characterized by comprising the following steps:
s1, heating 100 parts by weight of petroleum-based asphalt to 150-170 ℃ to obtain asphalt slurry, and stirring for later use;
wherein the stirring speed is 30-60 r/min;
s2, adding 15 parts of polycarbosilane powder into the asphalt slurry according to the proportion, and uniformly stirring; adding 8 parts of KH792 silane coupling agent, and uniformly stirring to obtain a modified asphalt finished product;
wherein the softening point of the polycarbosilane is 90 ℃; adding polycarbosilane powder into the asphalt slurry, stirring at the speed of 30-60r/min for 5-9min, then stirring at the speed of 60-100r/min for 4-8min, and then stirring at the speed of 30-60r/min for later use; after adding the silane coupling agent, stirring for 5-9min at the speed of 30-60r/min, then stirring for 4-8min at the speed of 60-100r/min, and then stirring for 6-10min at the speed of 30-60r/min to obtain a finished product of the modified asphalt.
2. The method of claim 1, wherein the polycarbosilane powder has a particle size of 2-10 mesh.
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| US20140261079A1 (en) * | 2013-03-13 | 2014-09-18 | Heritage Research Group | Polysilazanes as anti-strip agents for asphalt |
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Effective date of registration: 20230821 Address after: 521000 East of Lake Factory Building on the southeast side of Anhuang Road, Liuxi Town, Xiangqiao District, Chaozhou City, Guangdong Province Patentee after: Chaozhou Jinxin Asphalt Concrete Co.,Ltd. Address before: Room 306, 3rd floor, R & D East Building, Xiangyou science and Technology Park, 2 Yulan Road, Changsha hi tech Development Zone, Hunan 410000 Patentee before: HUNAN XINCHANGSHENG MATERIAL TECHNOLOGY Co.,Ltd. |